http://www.dw-world.de/dw/article/0,2144,3675511,00.html
... The arrests took place in Cologne on Friday when a Somali and a German 
of Somali descent were escorted off a plane bound for the Dutch city 
Amsterdam.
... "were planning to carry out an attack in the near future."
... Police apparently stepped in to prevent them from joining their comrades 
in the Islamic Jihad Union, (IJU), often described as a successor to the 
terrorist network al Qaeda.
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They also mention the IJU pair of Eric Breininger and Hussain al-Malla.

If you want to look into the IJU on the internet, IMO this is a good place 
to start:
http://www.ccc.nps.navy.mil/si/2008/Jul/steinbergJul08.asp